Hi, I just completed the Mantle Fuzz. I'm noticing an issue and hope someone can assist me with the solution. starting around the 12th fret, the effect seems to dramatically duck the audio when a note is plucked. the sound decreases dramatically and then returns slowly. it does allow the initial transient to come through resulting in a loud pop. it doesnt seem to happen on the lower pitched notes on the guitar, although i do notice a bit of an volume oscillation when a note is sustained. any thoughts as to what could be causing this issue and how to fix it?